import R from 'remeda';

import { DuxAggregateState, UpduxConfig } from './types';
import { Action, ActionGenerator } from './actions.js';

export class Updux<
    TState extends any = {},
    TActions extends { [key: string]: ActionGenerator } = {},
    TSubduxes = {}
    > {
    #localInitial: any = {};
    #subduxes;
    #actions : TActions;

    constructor(config: UpduxConfig<TState, TActions, TSubduxes>) {
        this.#localInitial = config.initial ?? {};
        this.#subduxes = config.subduxes ?? {};

        this.#actions = config.actions ?? ([] as any);
    }

    get actions() {
        return this.#actions;
    }

    get initial(): DuxAggregateState<TState,TSubduxes>{
        if (Object.keys(this.#subduxes).length === 0) return this.#localInitial;

        return Object.assign(
            {},
            this.#localInitial,
            R.mapValues(this.#subduxes, ({ initial }) => initial),
        );
    }

    get reducer(): ( state: DuxAggregateState<TState,TSubduxes>, action: Action ) => DuxAggregateState<TState,TSubduxes> {
        return (state,action) => this.upreducer(action)(state);
    }

    get upreducer(): (action: Action) => (state: DuxAggregateState<TState,TSubduxes>) => DuxAggregateState<TState,TSubduxes>  {
        return (action) => state => state;
    }
}